EDIT

package eu.etaxonomy.taxeditor.navigation.navigator.handler;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.UUID;

import org.eclipse.core.commands.AbstractHandler;

	 * @see org.eclipse.core.commands.IHandler#execute(org.eclipse.core.commands.ExecutionEvent)

	 */

	/** {@inheritDoc} */

	@Override

    public Object execute(ExecutionEvent event) throws ExecutionException {

		activePage = HandlerUtil.getActiveWorkbenchWindow(event).getActivePage();

		TreeSelection selection = (TreeSelection) HandlerUtil.getCurrentSelection(event);

		Iterator selectionIterator = selection.iterator();

		// do not show the current selection

		List<UUID> excludeTaxa = new ArrayList<UUID>();

			Object object = selectionIterator.next();

			if(object instanceof TaxonNode){

				excludeTaxa.add(taxonNode.getTaxon().getUuid());

			}

			if( MessageDialog.openConfirm(HandlerUtil.getActiveShell(event), "Moving taxon", "The operation move accepted taxon to other parent is available only for a single taxon.")){

				return null;

			}

//		TaxonNode taxonNode = (TaxonNode) selection.getFirstElement();

			boolean moveToNewParent = true;

			if (PreferencesUtil.getSortNodesNaturally()){

				if(!MessageDialog.openQuestion(null, "Target node", "The choosen target node should be the parent?")){

				AbstractPostOperation operation = new MoveTaxonOperation

						("Move taxon to new parent", NavigationUtil.getUndoContext(),

				NavigationUtil.executeOperation(operation);

				taxonNavigator.refresh();

			}

		}

		return null;

	}

		return false;

	}

}